Furnace



UNITED STATES PATENT OEEICEe MICHAEL C. BROWNE, OF HOLYOKE, MASSA.CI-IUS'ITS,l

FuRNAcE.

SPECIFICATION forming part of Letters Patent No. 514,906, dated February V2O, 1894.

Application tiled April 6, 1893. Serial No. 469,243. (No model.) l

To all whom it may concern:

Be it known that I, MICHAEL C. BROWNE, acitizen of the United States, residing-at Holyoke, in the county of Hampden and State of Massachusetts, have invented new and useful Improvements in Furnaces, of which the following isa specification.

The object of this invention is to construct, in an improved manner, a boiler or any other furnace so that theproducts of combustion, after passing away from the combustion chamber, either directly, or by way of the boiler flues, but before passing up'the chimney or smoke-stack may be utilized for heatingto a material degree the air to be entered into the furnace chamber for supporting combustion of the coal resulting, as manifest, in an "economy of fuel. And to this end the invention consists in arrangements and constructions of parts, all substantially as will hereinafter fully appear and be set forth in the claims.

Reference is to be had to the accompanying drawings, in which- Figure l is a sectional elevation from front to rear of a boiler furnace with the present improved appliances combined therewith. Fig. 2,is in part a rear elevation and in part a vertical cross section on line 2 2, Fig. 1.

Similar letters of reference indicate corresponding parts in both views.l

In the drawings, A represents a boiler furnace of the type in which the boiler, B, is set over the fire-box and combustion chamber, it

having ilues, a, through it from end to end," as usual, the products of combustion passing" from the rear end forwardly and up the smokepipe, b, to the smoke-stack,-or chimney, which is indicated in part at d.

In the improved arrangement it will be seen that `the smoke-pipe, b, and chimney, d, are not, as it were, the one a part of the other, but there are a series of longitudinally running separated flues,f, f,above the boiler, the ends of which are open to the said smokepipe and chimney, b, d. .These lines are inclosed within a casing, g, through which are a series of cross air-nues, h, h, the ends of which are closed, as at-h2.

At one portion of the casing, at one side, is an air inlet opening, t', for the free entrance of atmospheric air to the cross flues, while at the other side of the casing, preferably at a diderentpoint along its length, is an air egress opening,j, connectedwith which is a pipe, Imy, which leads forwardly and downwardly to communication with the furnace chamber.

Ain-entering all of the air dues through the opening, ,-by contact with the iiues through which the Waste products of combuston are passing, becomes heated in a material degree so that in being drawn out of the opening, j, and -through the pipe, m, in coming into the furnace chamber, is in a condition to more readily establish combustion than if it were entered cold.

In my air-heating apparatus, as I have constructed it, I have formed the air flues by long, rectangularshe'ets of thin metal bent to form iiattened tube sections, (the cross section of which is seen in Fig. l, while the lengths thereof appear in Fig. 2) and these tube sections are placed one above another, with separation between them corresponding to the Vertical dimensions of the smoke dues, f, and are held in such separation by longitudinally arranged angle-strips, o, o, which areinterposed between the end portions of the contiguous` fiattened tube sections. This rectangular formed bank of longitudinal and cross dues,-each with wide, superficial area at top and bottom,'-is set' within the rectangular casing having preferably a length somewhat longer than the bank of flues, with the ends of which casing the smoke-pipe and chimney are connected, and through the opposite sides of which the openings@ and j, are formed.

The apparatus, substantially as described, is not necessarily limited to use in conjunction -with a boiler-furnace, as, manifestly, it may be used with other descriptions of furnace. Y

I-Iaving thus described my invention, what I claim, and desire to secure by Letters Patl. In combination, a furnace and a horizontally extended rectangular casing thereabove with one end of which the combustion chamber is in communication, and the smoke stack with which the other end of said casing oommunicates, and said casing having openings through its sides at different parts of its length, horizontal partitions which extend across lthe width of said casing, alternating pairs of which are closed at their sides, but

open at both ends thereby constituting broad fiat longitudinal smoke iues, While the relatively intermediate alternating pairs of said partitions are closed at their ends but open at their sides to the aforesaid side openings and constituting broad, fiat intermediate air heating passages and a conduit communicating with the one of said side openings and leading to the combustion chamber, substan tially as described.

2. The combination with a furnace, of a bank of cross-iues for air and longitudinal fines for smoke consisting of Hattened tubesections arranged with their lengths cross- Wise of the smoke Iiues, and in separation portion of the furnace-chamber, substantially z 5 as and for the purpose set forth.

MICHAEL C. BROWNE. Wi-messes:

WM. S. BELLOWS, K. I. CLEMoNs, 

